What I am seeing here is a complete wrong use of the trust system and feedback retaliation. I think the former is worse than the later.
Although, I don't know theymos's opinion about retaliation in the trust system. But I personally think retaliation will only be fine and fair if both party are on DT or both parties are not on DT (the later is preferable).

Trust feedback is for trading. Someone's political believe might differ from urs (even if it's wrong) but the person can be trustworthy to be traded with. If for instance all Ukrainians start using red tag on Russians and vice versa, the red tag would be abused 100%.

As someone said above, OP if you want your neg tag to be removed, first removed yours.